ceramides
Every Ceramide Explained: A Field Guide to Cosmetic Ceramides on Your INCI List
A complete reference for the cosmetic ceramides you'll see on skincare labels, what each one does, what the cryptic two-letter names mean, and how to pick a formula that actually rebuilds the barrier.
If you’ve ever stared at the back of a barrier moisturiser and tried to parse “Ceramide NP, Ceramide AP, Ceramide EOP”, you are not alone. The naming system for cosmetic ceramides is one of the most opaque conventions on the entire INCI list. It looks like a hardware spec sheet, but it’s actually telling you exactly how the molecule is built.
This guide is the decoder ring. We’ll cover what each letter means, walk through every cosmetic ceramide you’ll see on a label, explain the structural logic behind the family, and end with a quick-reference INCI cheat sheet you can keep open while shopping.
For the wider story of why ceramides matter to the skin barrier, we have a separate post. This one is the field guide.
The naming system in 60 seconds
A cosmetic ceramide is two parts: a sphingoid base (the backbone) plus a fatty acid (the tail) connected by an amide bond. The current INCI name encodes both:
- First letter(s) = the fatty acid type
- N = Non-hydroxy fatty acid (a plain saturated chain)
- A = Alpha-hydroxy fatty acid (one OH near the head)
- EO = Esterified Omega-hydroxy fatty acid (a long chain with linoleic acid esterified at the far end; these are the “anchoring” ceramides)
- Second letter = the sphingoid base
- S = Sphingosine (an unsaturated 18-carbon backbone)
- DS = Dihydrosphingosine (the saturated version of S)
- P = Phytosphingosine (an extra hydroxyl, more polar, common in fungi and plants)
- H = 6-Hydroxysphingosine (mostly in human skin, less common in cosmetics)
So Ceramide NP = Non-hydroxy fatty acid + Phytosphingosine. Ceramide EOS = Esterified Omega-hydroxy fatty acid + Sphingosine. Once you have the decoder, the names are descriptive rather than mysterious.
The older naming system used numbers (Ceramide 1, 2, 3…) assigned roughly in the order they were isolated from human skin. Most legacy labels still use the numbers; modern labels increasingly use the letters. Both refer to the same molecules. INCI ratified the letter-based system because the numbering wasn’t internally consistent.
The nine cosmetic ceramides, one by one
Below are the ceramides you’ll realistically encounter on a skincare label, with their old number, current INCI name, structural shorthand, and what each one actually does in a formula.
1. Ceramide EOP (formerly Ceramide 1)
Structure: Esterified Omega-hydroxy fatty acid + Phytosphingosine.
This is the “anchor” ceramide. The ultra-long fatty acid chain (often 30+ carbons) with a linoleic acid esterified at the end is what links the lamellar lipid sheets to the corneocyte envelope. Without EOP, the barrier mortar literally has nothing to grip onto. It’s structurally critical, even at relatively low concentrations.
Look for it in: Premium barrier creams. It’s expensive to manufacture, so its presence is a strong signal of a clinically formulated product.
2. Ceramide NS (formerly Ceramide 2)
Structure: Non-hydroxy fatty acid + Sphingosine.
The most abundant ceramide in healthy young skin. NS levels decline with age, sun exposure, and chronic eczema. Replacing it topically restores the bulk volume of the barrier mortar.
Look for it in: Anti-aging moisturisers, repair masks.
3. Ceramide NP (formerly Ceramide 3)
Structure: Non-hydroxy fatty acid + Phytosphingosine.
The most-studied and most-formulated cosmetic ceramide. It’s structurally robust, stable in finished formulas, well-tolerated, and clinical trials consistently show it reduces transepidermal water loss within 14 days of use. If a moisturiser has any ceramide, statistically it has Ceramide NP.
Look for it in: Essentially every barrier moisturiser on the market, from drugstore to luxury tier.
4. Ceramide EOS (no commonly used legacy number)
Structure: Esterified Omega-hydroxy fatty acid + Sphingosine.
Sister molecule to EOP, with the unsaturated sphingosine backbone instead of phytosphingosine. Like EOP, it’s an anchor ceramide critical for lamellar organisation. Less common in formulas because it’s even more synthesis-intensive.
Look for it in: Clinical-grade barrier formulas. Often in 3:1:1 ratio products.
5. Ceramide AS (formerly Ceramide 5)
Structure: Alpha-hydroxy fatty acid + Sphingosine.
The alpha-hydroxyl group adds polarity, changing how the molecule packs in the lipid sheet. AS is found in healthy skin at moderate levels and contributes to the fine-grain structure of the barrier.
Look for it in: Less common in cosmetics. When it appears, it’s usually paired with NP and AP.
6. Ceramide AP (formerly Ceramide 6 II)
Structure: Alpha-hydroxy fatty acid + Phytosphingosine.
The most popular “second ceramide” after NP. Pairing NP with Ceramide AP is the most common combination in modern barrier formulas because the two molecules pack differently. Together they create a denser, more stable lamellar sheet than either one alone.
Look for it in: Nearly every CeraVe, La Roche-Posay Toleriane, Dr. Jart Ceramidin, and Skinfix Barrier+ formula.
7. Ceramide NDS
Structure: Non-hydroxy fatty acid + Dihydrosphingosine.
The saturated version of NS. Less prevalent in healthy skin than NS itself, but increases as skin ages. It appears to be the “fallback” structure when the body can’t produce enough NS. Still occasionally appears in advanced anti-ageing formulas.
Look for it in: Specialised anti-ageing ceramide blends. Rare.
8. Ceramide AH
Structure: Alpha-hydroxy fatty acid + 6-Hydroxysphingosine.
The H-base ceramides are abundant in human skin but underused in cosmetics because the 6-hydroxysphingosine starting material is difficult to synthesise. AH and its NH/EOH siblings are the frontier of barrier replenishment research. Expect more of them in formulas over the next decade.
Look for it in: Cutting-edge research formulations, often labelled “biomimetic.”
9. Phytosphingosine and Sphingosine (the precursors)
These are not technically ceramides. They’re the sphingoid bases that the body uses to build ceramides on demand. When applied topically, the skin can convert them into endogenous ceramides via the ceramide synthase enzymes.
They also have direct antimicrobial activity, which is why Phytosphingosine appears on the INCI of many barrier products in addition to (or instead of) finished ceramides. It does double duty as a precursor and a mild antibacterial.
Look for it in: Many ceramide formulas list it after the named ceramides, a sign of a well-thought-out formulation.
Plant-derived and “pseudo” ceramides
Two additional categories you’ll see on labels:
Plant-derived ceramides are extracted from rice (rice bran extract, oryza sativa ceramide), wheat (triticum vulgare ceramide), or konjac. They’re chemically similar but not identical to the named cosmetic ceramides above; the fatty acid distribution differs. Clinical evidence is weaker than for the synthesised NP/AP/EOP series, but they’re still functionally moisturising and they tend to be cheaper. Adequate for daily moisturisers; not the choice if you have a clinically compromised barrier.
Pseudo-ceramides (sometimes labelled “ceramide analogues” or under trade names like Questamide, Pseudoceramide SLE66) are synthetic small molecules designed to mimic the lamellar-packing behaviour of real ceramides without the cost of full biosynthesis. They work reasonably well but aren’t structurally identical to the real thing.
If a product just says “ceramides” on the front without specifying which ones, check the INCI carefully. It might be a plant or pseudo variant.
The quick-reference INCI cheat sheet
| INCI Name | Legacy Number | Role in the Barrier |
|---|---|---|
| Ceramide EOP | Ceramide 1 | Anchor that links the lipid sheet to corneocytes |
| Ceramide NS | Ceramide 2 | Bulk volume of the barrier mortar |
| Ceramide NP | Ceramide 3 | Workhorse, most-formulated |
| Ceramide EOS | n/a | Second anchor variant |
| Ceramide AS | Ceramide 5 | Fine-grain structure |
| Ceramide AP | Ceramide 6 II | Pairs with NP for denser lamellae |
| Ceramide NDS | n/a | Saturated alternative to NS |
| Ceramide AH | n/a | Biomimetic frontier |
| Phytosphingosine | n/a | Precursor + mild antimicrobial |
| Sphingosine | n/a | Precursor |
How LuxSense scores the ceramide family
Across the LuxSense database, the named cosmetic ceramides score in the high 90s, typically 94–98. There are no EU regulatory restrictions, no PubChem hazard codes, no comedogenicity concerns at cosmetic concentrations, and overwhelmingly positive clinical evidence. The score variance comes down to depth of clinical data, not safety.
Plant-derived ceramides score similarly because they share the regulatory profile, but the clinical-evidence weight is lower.
FAQ
If a product only lists “Ceramide NP,” is that enough?
It’s a fine moisturiser but it’s not a clinical barrier-repair formula. The barrier mortar in healthy skin is a mixture. Single-ceramide products replicate only part of that mixture. Look for at least three named ceramides plus cholesterol on the INCI for a properly built repair formulation.
What’s the difference between “Ceramide 3” and “Ceramide NP”?
They are literally the same molecule. The numeric name is the legacy convention; the letter name is the current INCI standard. Brands often list both for clarity, e.g., “Ceramide NP (Ceramide 3).”
Why are some ceramides expensive and others cheap?
Synthesis complexity. Plain NP and AP can be biosynthesised efficiently with yeast fermentation. The EO-class ceramides require attaching a long-chain fatty acid with linoleic acid esterification across multiple enzymatic steps. Anchor ceramides are 5–10× the cost per gram of NP.
Can I just take ceramide supplements instead?
Oral wheat-derived ceramide supplements have some clinical data for improving skin hydration, but topical ceramides have far stronger and more direct evidence. The two approaches aren’t mutually exclusive, they likely complement each other, but topical is the higher-leverage intervention.
Scan any barrier cream with LuxSense to see which ceramide types are present and how the formula compares to the 3:1:1 ceramides:cholesterol:fatty acids ideal. Or browse the individual profiles for Ceramide NP, Ceramide AP, and Ceramide EOP for the EU regulatory and PubChem data behind each score.